<!doctype html>
<html lang="zh-cn">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>background-attachment视差滚动</title>
  <!--  <link rel="stylesheet" href="./styles/index.css" />-->
</head>
<style>
  section {
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    line-height: 100vh;
    text-align: center;
    font-size: 20vh;
  }

  .g-img1 {
    background-image: url("http://pic7.photophoto.cn/20080407/0034034859692813_b.jpg");
    background-attachment: fixed;
    background-size: cover;
    background-position: center center;
  }

  .g-img2 {
    background-image: url("http://up.enterdesk.com/edpic_source/21/00/00/210000f8e772d7fc0758e67ae4b48807.jpg");
    background-attachment: fixed;
    background-size: cover;
    background-position: center center;
  }

  .g-img3 {
    background-image: url("https://images.unsplash.com/photo-1440688807730-73e4e2169fb8?dpr=1&auto=format&fit=crop&w=1500&h=1001&q=80&cs=tinysrgb&crop=");
    background-attachment: fixed;
    background-size: cover;
    background-position: center center;
  }

</style>
<body>
<section class="g-word">Header</section>
<section class="g-img1">IMG1</section>
<section class="g-word">Content1</section>
<section class="g-img2">IMG2</section>
<section class="g-word">Content2</section>
<section class="g-img3">IMG3</section>
<section class="g-word">Footer</section>
</body>
</html>
